The Middle East, once a region of great religious diversity, has seen a mass emigration of minorities in recent decades. It's now one of the most religiously monolithic regions in the world. One Middle East scholar says the trend is likely to continue as tensions there continue to grow.

The Middle East, once a region of great religious diversity, has seen a mass emigration of minorities in recent decades. It's now one of the most religiously monolithic regions in the world. One Middle East scholar says the trend is likely to continue as tensions there continue to grow.

The Middle East, once a region of great religious diversity, has seen a mass emigration of minorities in recent decades. It's now one of the most religiously monolithic regions in the world. One Middle East scholar says the trend is likely to continue as tensions there continue to grow.

The Middle East, once a region of great religious diversity, has seen a mass emigration of minorities in recent decades. It's now one of the most religiously monolithic regions in the world. One Middle East scholar says the trend is likely to continue as tensions there continue to grow.